36results about How to "Alleviate the current situation of resource shortage" patented technology

The invention provides a eugenol epoxy resin and a preparing method and application thereof. The eugenol epoxy resin is prepared from a compound shown in the formula I in the description and / or a compound shown in the formula II in the description. The epoxy resin is free of biotoxicity, the mechanical property of the epoxy resin is similar to that of traditional epoxy resin, and the eugenol epoxy resin can replace traditional petroleum-based epoxy resin. The epoxy resin is liquid at the room temperature, and is beneficial to subsequent processing and application and capable of being used for preparing composites, paint, adhesives and the like.

The invention belongs to the field of hydrometallurgy and inorganic chemical industry, and particularly relates to a method for extracting manganese from low-grade high-silicon manganese ore containing manganese silicate minerals. The method comprises the technological steps as follows: pretreatment: adding concentrated sulfuric acid to high-silicon manganese ore powder containing 30%-50% of the manganese silicate minerals for aging treatment; leaching: a, adding a pretreated product to water for leaching and separation to obtain a manganese leachate 1 and leached residues; b, adding high-silicon manganese ore to the manganese leached liquid 1, and performing separation to obtain a manganese leached liquid 2 and a solid-phase leached product; treatment of the solid-phase leached product: mixing the solid-phase leached product with concentrated sulfuric acid for aging treatment, and performing separation to obtain a manganese leached liquid 3 and leached residues, and returning the leached liquid 3 to the step b to be used as a leaching agent for leaching high-silicon manganese ore. Under milder conditions, rhodochrosite minerals in the ore can be fully extracted, manganese silicate can be converted into manganese sulfate, the leaching rate of manganese can reach about 90%, and accordingly, the recovery rate of manganese is greatly increased, industrial implementation is easier and the method is environment-friendly.

The invention discloses a preparation method of an antibacterial and flame-retardant fiber, which specifically comprises: washing and drying the collected white pure cotton waste fabrics, crushing them, then using hydrogen peroxide for oxygen bleaching, drying, and then using sodium hydroxide or sodium carbonate solution Processing and drying to obtain alkali cellulose; mixing alkali cellulose / hydroxyl-containing phosphorus flame retardant and cross-linking agent to make the mixture undergo a hydroxylation cross-linking reaction to prepare flame-retardant cellulose, and combine flame-retardant cellulose with The nano antibacterial sol is mixed to prepare a cellulose solution, and then spun to obtain primary fibers, and the primary fibers are treated to obtain antibacterial and flame-retardant fibers. The invention also discloses a method for preparing the antibacterial and flame-retardant fabric. The invention discloses a method for preparing antibacterial and flame-retardant fibers. The antibacterial and flame-retardant fibers are prepared by using waste and old white pure cotton fabrics, which can make full use of resources and reduce environmental pollution. The antibacterial and flame-retardant fabrics prepared by using the fibers have long-lasting antibacterial and flame-retardant properties. Stable and washable, after 50 times, the antibacterial and flame retardant properties still meet the standard requirements.

The invention discloses a calcium / magnesium-based wet desulfurization and calcium / magnesium sulfite resource utilization system and process. SO 2 React with calcium / magnesium-based desulfurization slurry to generate calcium / magnesium sulfite, and add oxidation inhibitors to the desulfurization slurry to inhibit the oxidation of calcium / magnesium sulfite to calcium / magnesium sulfate. For high concentrations of SO produced by calcium / magnesium sulfite roasting 2 The flue gas undergoes a reduction reaction at high temperature and is directly reduced to elemental sulfur vapor. After dust removal, temperature reduction, and fine dust removal processes, sulfur is recovered by the sulfur recovery device. Calcium / magnesium oxide is used as a desulfurizer and returned to the desulfurization tower for recycling.

The invention relates to a method for preparing biological gasoline from biomass, which comprises the following steps: biomass hydrolysis: hydrolyzing biomass in 0.1-10% dilute acid at 140-220 DEG C for 5-240 minutes to prepare levulinic acid; carrying out dehydration reaction on the levulinic acid at 130-180 DEG C for 60-180 minutes under the action of 0.1-5% liquid acid, acidic ionic liquid or molecular sieve to prepare angelica lactone; carrying out polymerization reaction on the angelica lactone at 60-160 DEG C for 1-180 minutes under the action of 0.1-5% inorganic alkali to prepare an angelica lactone polymer; and carrying out hydrogenation reaction on the angelica lactone polymer at 200-400 DEG C for 4-60 hours under the action of a 0.1-5% catalyst to obtain the final product biological gasoline. The method can greatly enhance the carbon utilization ratio, reduce the carbon dioxide emission, and lower the dependence on petroleum and other nonrenewable resources. The method has the advantages of short technical process and mild reaction conditions; and the product has the advantages of high yield and high quality.

The invention discloses a system and method for petroleum coke synergistic gypsum calcination and charcoal thermal reduction. The system and the calcination furnace are divided into an upper section and a lower section, the upper section is an oxidation calcination area, and the lower section is a reduction calcination area. An oxygen-containing gas inlet is provided; the lower section is respectively connected with the gypsum source and the petroleum coke source; the carbon thermal reduction tower, its gas inlet is connected with the gas outlet of the calciner through a high-temperature separator, its solid inlet is connected with the petroleum coke source, and its solid outlet It is connected with the calciner; the gas inlet of the sulfur recovery device is connected with the gas outlet of the carbon thermal reduction tower. Not only can it solve the problem that low-grade industrial gypsum (mainly calcium sulfate) and high-sulfur carbon materials in China are difficult to handle, but it can also make them collaborative resource utilization and recover high-quality sulfur and calcium oxide. Alleviate the current situation of shortage of sulfur resources in our country and reduce the foreign dependence on sulfur resources. In addition, calcium oxide can replace limestone as a desulfurization agent for wet desulfurization.

The invention relates to a process and method for preparing sulfur by coal gasification in conjunction with calcium sulfate calcination and charcoal thermal reduction. For the reaction of calcium sulfate with carbon materials and sulfur at high temperature to produce high concentration of SO 2 Flue gas and metal calcium oxide, using U-shaped coal gasification calciner, charcoal thermal reduction tower, sulfur recovery device and various heat exchangers, etc., through precise control of various reaction conditions, sulfur is prepared from solid waste calcium sulfate that is difficult to handle, and at the same time Calcium oxide is a by-product, which can replace limestone as a desulfurization and denitrification agent.

The present application discloses a hardenability-preserving gear steel and a preparation method thereof, comprising the following components in mass percentage: C: 0.18-0.21%, Si: 0.20-0.28%, Mn: 0.75-1.05%, Cr: 0.95-1.25 %, Ti:0.035-0.055%, Al:0.020-0.035%, B:0.0008-0.0030%, P≤0.020%, S≤0.010%, T[O]≤20ppm, T[N]≤80ppm, Ni≤0.10 %, Cu≤0.20%, Mo≤0.10%, and the rest is Fe. This application adopts the converter, double refining and continuous casting process, through the control of primary refining and intensive refining, argon blowing at the ladle nozzle, full protection of mold slag process, plasma tundish heating, constant temperature and constant pulling speed casting, and composite electromagnetic stirring to produce narrow castings. Hardened zone, gear steel with excellent fatigue life.

The invention relates to a device and method for joint production of iron, sulfur and gas in the smelting process of pyrite, and belongs to the field of metal smelting. The method comprises the following steps of calcining the pyrite at the bottom part of the interior of a calcining-gasifying reaction tower, enabling pulverized coal and fly ash to generate gasifying reaction at the middle upper part, enabling the sulfur-containing flue gas to carry the high-valence oxide of iron produced by calcining at the tower bottom to the middle upper part of the reaction tower, mixing with the gas and coke produced by gasifying, and generating oxidation and reduction reaction; separating the product by an iron-based high-temperature separator and a carbon-based high-temperature separator, and sendingback into an iron oxide reduction tower; performing secondary reduction reaction on the iron oxide in the iron oxide reduction tower, and producing reduction gas, so as to obtain iron slag; purifyingthe crude gas, so as to obtain the purified gas; enabling a sulfur condenser to condense and recycle the sulfur. The method has the advantages that the joint production of iron, sulfur and gas is realized in the smelting process of the pyrite, and the pyrite can be efficiently and cleanly utilized.

The invention relates to a process and device for gypsum calcination coordinated with CO coupled carbon thermal reduction. Circulating exhaust gas contains high concentration of CO 2 , react with coke to generate CO, part of CO is used to reduce gypsum and SO 2 , the other part is used for supplementary heat in the gypsum reduction and calcination process; after calcination, the flue gas contains high concentration of SO 2 ; Calcined flue gas reacts in the temperature range of 600-1000°C to generate elemental sulfur vapor under the catalysis of activated carbon materials. Sulfur is recovered after the elemental sulfur vapor is cooled and dedusted. Part of the reduced exhaust gas after sulfur recovery enters the flue gas purification system for purification and then is emptied, and the other part is returned to the system as circulating exhaust gas to provide high-concentration CO for the system. 2 . The circulating exhaust gas in the system is preheated by reducing the temperature of the reducing gas. The oxygen-enriched oxygen supplemented by the gypsum reduction and calcination process is preheated by cooling the calcined product quicklime and exothermic. The gypsum is dried and preheated by the calcination flue gas. This system realizes the energy level Utilization; in order to achieve the heat balance of the system, an external heat source is needed to supplement the heat of the system.